Retro revolution is a good store, but not if you're bargain shopping. If you want to find something for a good price there's a store on harry hines called public wholesale that has a big "head shop" section. You can get downstems for $2 and I got a hand pipe for 20 when similar ones are going for 30-40 at head shops. They have pretty good deals on hookas too sometimes.

They don't have the greatest selection, but it does change a lot, and you can ask what else he has back there and the guy pulls out all kinds of stuff that's not on display. Anyway, I reccommend you check this place out. It's between denton drive and harry hines near forest lane intersects them. There's a little ghetto shopping center called "shopper's alley" and thats where public wholesale is.